Celtic art is a very distinctive type of metalwork which emerged in the 5th century B.C.E. The Celts They decorated weapons, armor, and drinking vessels, and jewelry, working in bronze and gold and using sophisticated inlay techniques. They used geometric designs such as maze and repeated patterns, spiral and leaf shaped designs, animals, and the most commonly identified the knot. The knot looks like strands of woven or braided strips that bend and weave amongst themselves. One of the most common designs is called the Trinity Knot, which has 3 outer points or petals, and weavings occurring within the center. For a view of the different types of Celtic metal work see http://www.aon-celtic.com/trade_history_meanings.html.